Polymorphism in c#

Def:

Polymorphism means having more than one form. Overloading and overriding are used to implement polymorphism.

Polymorphism is of two types:

1. Compile time polymorphism/Overloading
   
2. Runtime polymorphism/Overriding
   

Polymorphism provides following features: 

• It allows you to invoke methods of derived class through base class reference during runtime.
• It has the ability for classes to provide different implementations of methods that are called through the same name.  

          Compile Time Polymorphism :

• •     Compile time polymorphism is method and operators overloading. It is also called early binding.
   
  • In method overloading method performs the different task at the different input parameters.
  
  

  Runtime Time Polymorphism :

  • Runtime time polymorphism is done using inheritance and virtual functions. Method overriding is called runtime polymorphism. It is also called late binding.
   
  • When overriding a method, you change the behavior of the method for the derived class.  Overloading a method simply involves having another method with the same prototype.
   
  • • Note: Don't confused method overloading with method overriding, they are different, unrelated concepts. But they sound similar.    

    Sample code:(overloading)

     public partial class Overloading : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
           {
            A a = new A();      
            int r = a.m(10, 6); 
            Response.Write(r);
            }
    }
    public class A
    {
        public int m(int x, int y)
        {
            return x + y;
        }
        public int m(string x, int y)
        {
            return Convert.ToInt32(x)+ y;
        }
    }
    
     
    

    Runtime polymorphism/Overriding:

    { this topic discuss another post(virtual and overridding)} 

    Note: Bec few propertes need to impliment this topic(upcasting,downcasting,...)